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Ms Burt said the biker fell off his bike, a small 125cc type motorbike, and his bike dropped on top of him.

She added: "I stopped the car and got out. The biker wasn't wearing any leathers or protective clothes and he didn't get up. The people in a van and the car that him got out and moved the bike off him. The driver who hit him was quite shocked.

"I saw that other drivers were looking after the biker so I started redirecting traffic and told the cars to turn around."

A39 traffic build up after RTC near Devoran roundabout

The incident happened shortly after 8.30am not far from the Norway Inn pub at Perranarworthal on the A39.

A tweet from Truro Specials warned traffic to avoid the area.

The tweet said: "TRAFFIC. long delays on the A39 near the Norway due to RTC. AVOID."

Police have confirmed they were called out to the scene by paramedics to help close the road so an air ambulance could land nearby to take the injured biker to hospital.

However South West Ambulance Service said that in the end the air ambulance was not required and the biker was treated by two paramedic crews at the scene.

A spokeswoman said: "We received a call 8.40am to reports of a two vehicle RTC. One male patient suffered a minor ankle injury.

"We attended with two rapid response vehicles and one ambulance. The patient treated at the scene."